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Re: [PATCH 1/2] xen/rangeset: fix incorrect subtraction
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 11 Apr 2025 10:16:17 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 11 Apr 2025 08:16:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.04.2025 09:55, Roger Pau Monne wrote:
> Given the following rangset operation:
>
> { [0, 1], [4, 5] } - { [3, 4] }
>
> The current rangeset logic will output a rangeset:
>
> { [0, 2], [5, 5] }
>
> This is incorrect, and also has the undesirable property of being bogus in
> a way that the resulting rangeset is expanded.
>
> Fix this by making sure the bounds are correctly checked before modifying
> the previous range.
>
> Fixes: 484a058c4828 ('Add auto-destructing per-domain rangeset data
> structure...')
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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